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Adapting cell battery to HP 41
02-27-2019, 01:30 PM (This post was last modified: 02-27-2019 01:38 PM by Artur - Brasil.)
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RE: Adapting cell battery to HP 41
(02-27-2019 03:48 AM)Craig Bladow Wrote:  A very creative solution! I believe the card reader is the largest typical load a 41c will see.
I agree with you.
About the cell phone battery, there are plenty of them out in market. Anyone that feets inside the HP-41 can be used.
The idea is: as much mAh you can get, go for it!

(02-27-2019 03:48 AM)Craig Bladow Wrote:  Now if there were a 3d printed battery pack to hold these components and spring loaded battery contacts.....

About the idea of a battery pack printed in 3d process, it would be the best.
In my solution, the board of charger was inserted in the side hole for AC adapter.
I had to make a small recess on HP to fit the board. I also had to cut in the board too.
I removed almost all the side of battery pack allowing to keep the boards in 41.
I also covered the space of battery pack in HP41 with tape to prevent lackage get inside it. This would be solved using a new sealed case, the one printed by 3d proccess.


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RE: Adapting cell battery to HP 41 - cruff - 02-26-2019, 12:45 PM
RE: Adapting cell battery to HP 41 - Artur - Brasil - 02-27-2019 01:30 PM

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